I went to Stir Trek in Columbus, Ohio a couple of weeks ago. There was some talk of Titanium. Mostly good. They also pointed out a few of the gotchas to be careful of; for instance, iOS has an event that is fired when you reach the end of a scrollable list view, but Android does not. All-in-all nothing that can't be worked around. Again, mostly good comments, just warnings that you should
expect it to be the end-all-be-all for cross platform development.